Question regarding wbc3 campaign removal

So, I just updated to the new version, once I got my gaming computer up and running, and I noticed that the original campaign has been removed and a custom one put in place. Was there a reason for doing that? I'm ok with it (though the initial stage of the new campaign is a bit confusing), as I've played the old campaign a million times, just curious as to the reasons.

I get it, though, I think it was mentioned somewhere that the original campaign will be available as 'DLC'. Personally, I've only come to The Protectors due to WBC2 which I played way more than WBC3. I didn't even complete the original campaign.